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I have a table where I want to split the top left cell in 2 diagonally, as in this question. All the answers I have found online are latex code, but I only know how to use Lyx. Is there a way to do it in Lyx?

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1 Answers1

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In LyX you can enter LaTeX code.

Go to the menu item Document > Settings... > LaTeX Preamble, and insert

\usepackage{diagbox}

Then in the topleft cell, choose the menu item Insert > TeX Code and enter

\diagbox{xxx}{yyy} 

(whatever you want there).